How to specify the data type of a calculated column?
Enter the column name and accept the default data type ( nchar(10)). Database engine determines the data type of the computed column by applying the data type precedence rules to the expressions specified in the formula.
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How to get list of calculated columns in SQL Server?
Get a list of computed columns in a SQL Server database. We can use the sys.computed_columns system function and join it with sys.objects to get a list of available computed columns, their data type, and the column definition (formula).
How to specify column names in SQL Server?
When a formula combines two expressions of different data types, the rules for data type precedence specify that the data type with the lower precedence becomes the data type with the higher precedence. If the conversion is not a supported implicit conversion, the error “Error validating formula for column column_name. ” is returned.
Can a calculated column be referenced with another table?
You cannot reference columns from other tables for a computed column expression directly. You cannot apply insert or update statements on computed columns. If you are combining operators of two different data types in your expression, the operator with lower precedence will become the one with higher precedence.
How to create a calculated column in SQL Server?
We have defined a primary key and an identity column in column [EmpID]. Add a new column [Edad]. In this column, do not select the data type. SQL Server automatically assigns an appropriate data type based on the columns to the computed column in the SQL Server value.
Where does SQL Server store computed columns?
It means that SQL Server physically stores the computed column data on disk. When you change data in the table, SQL Server calculates the result based on the expression in the calculated columns and physically stores the results in these persistent columns.